As the subject says, does any one have any advice/pointers on this. Basicly I'm struggling, emulatorless, to find the cause of a data memory coruption problem with some C code which worked happily with the CCS/877 combination. Any suggestions on compiler or PIC diferences, known bugs etc... would be gratefully recieved Cheers Richard -- http://www.piclist.com hint: The PICList is archived three different ways. See http://www.piclist.com/#archives for details.